Update dependency phpunit/phpunit to ^9.6.18

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpunit/phpunit (source)	^9.6.17 -> ^9.6.18

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v9.6.18

Compare Source

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Configuration

📅 Schedule: Branch creation - "* 6-22/3 * * 1-5,* 12-23/3 * * 0,6" in timezone Europe/Amsterdam, Automerge - At any time (no schedule defined).

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[github-actions]

🏰 Composer Production Dependency changes 🏰

Prod Packages	Operation	Base	Target	Link
nikic/php-parser	Upgraded	v4.18.0	v4.19.1	Compare
phar-io/manifest	Upgraded	2.0.3	2.0.4	Compare
phpunit/php-code-coverage	Upgraded	9.2.30	9.2.31	Compare
phpunit/phpunit	Upgraded	9.6.17	9.6.18	Compare
sebastian/cli-parser	Upgraded	1.0.1	1.0.2	Compare
sebastian/exporter	Upgraded	4.0.5	4.0.6	Compare
sebastian/global-state	Upgraded	5.0.6	5.0.7	Compare
sebastian/resource-operations	Upgraded	3.0.3	3.0.4	Compare
theseer/tokenizer	Upgraded	1.2.2	1.2.3	Compare